Revert of Introduce v8::MicrotasksScope.

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <queue>
 #include <set>
 
@@ skipping 360 matching lines @@
   /* Part of the state of liveedit. */                                         \
   V(FunctionInfoListener*, active_function_info_listener, NULL)                \
   /* State for Relocatable. */                                                 \
   V(Relocatable*, relocatable_top, NULL)                                       \
   V(DebugObjectCache*, string_stream_debug_object_cache, NULL)                 \
   V(Object*, string_stream_current_security_token, NULL)                       \
   V(ExternalReferenceTable*, external_reference_table, NULL)                   \
   V(HashMap*, external_reference_map, NULL)                                    \
   V(HashMap*, root_index_map, NULL)                                            \
   V(int, pending_microtask_count, 0)                                           \
+  V(bool, autorun_microtasks, true)                                            \
   V(HStatistics*, hstatistics, NULL)                                           \
   V(CompilationStatistics*, turbo_statistics, NULL)                            \
   V(HTracer*, htracer, NULL)                                                   \
   V(CodeTracer*, code_tracer, NULL)                                            \
   V(bool, fp_stubs_generated, false)                                           \
   V(uint32_t, per_isolate_assert_data, 0xFFFFFFFFu)                            \
   V(PromiseRejectCallback, promise_reject_callback, NULL)                      \
   V(const v8::StartupData*, snapshot_blob, NULL)                               \
   ISOLATE_INIT_SIMULATOR_LIST(V)
 
@@ skipping 1182 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_